I discovered a few interesting peaks on the WLAN card of my Raspberry Pi on the “received” values. (I am using my MRTG/Routers2 installation for querying the network statistics via SNMP.) Since the use case for my Pi is only the temperature sensor which is queried over SNMP, too, I found the following network graph a bit confusing since the “incoming traffic” should be on the same level all the time: